A thin-film filter includes thin-film part having a film surface and a rear film surface arranged at the rear side of the film surface, a plurality of through holes, being formed to penetrate the thin-film part from the film surface to the rear film surface, the through holes are formed along by a slanting direction being made an acute angle or an obtuse angle with the film surface, and stripes-formed inner wall surfaces. The stripes-formed inner wall surfaces include stripe-like parts formed along by the slanting direction. The stripes-formed inner wall surfaces are formed inside the respective through holes.

An air filtering cover is adapted to engage with an infant carrier to filter air communicated into an interior cavity thereof. A cover body having two sidewalls and a filter element form a flowpath for air communicating through the body and filter to remove dirt, dust, and pathogens from air reaching the occupant of the interior cavity. The filter may be replaceable within a pocket formed in the cover body. A gauge strip may be positioned on the filter which changes in appearance when the filter needs replacement.

A filter has a filter center tube that includes a plurality of layers of solidified material including a first layer with a first undulating strip of solidified material extending in a first predetermined direction, and a second layer with a second undulating strip of solidified material extending in a second predetermined direction. The first layer is in contact with the second layer and the first predetermined direction is not parallel with the second predetermined direction, forming a plurality of pores therebetween.

The present invention relates generally to compositions for use in biological and chemical separations, as well as other applications. More specifically, the present invention relates to hybrid felts fabricated from electrospun nanofibers with high permeance and high capacity. Such hybrid felts utilize derivatized cellulose, and at least one non-cellulose-based polymer that may be removed from the felt by subjecting it to moderately elevated temperatures and/or solvents capable of dissolving the non-cellulose-based polymer to leave behind a porous nanofiber felt having more uniform pore sizes and other enhanced properties when compared to single component nanofiber felts.

The electret-treated sheet includes: a core layer (A) which is a porous film containing at least a thermoplastic resin; a surface layer (X) disposed on one side of the core layer (A); and a back surface layer (Y) disposed on the other side of the core layer (A), the surface layer (X) and the back surface layer (Y) each having a charged outermost surface, wherein the electret-treated sheet has a water vapor permeability coefficient of 0.1 to 2.5 g.Math.mm/m.sup.2.Math.24 hr; the core layer (A) has a pore aspect ratio of 5 to 50 and an average pore height of 2.5 to 15 m; the surface layer (X) and the back surface layer (Y) each have a thickness of 5 to 200 m; and the surface layer (X) includes a heat seal layer (B) including the outermost surface, wherein the heat seal layer (B) has a melting point of 50 to 140 C.

Microporous materials that include thermoplastic organic polyolefin polymer (e.g., ultrahigh molecular weight polyolefin, such as polyethylene), particulate filler (e.g., precipitated silica), and a network of interconnecting pores, are described. The microporous materials of the present invention possess controlled volatile material transfer properties. The microporous materials can have a density of at least 0.8 g/cm.sup.3; and a volatile material transfer rate, from the volatile material contact surface to the vapor release surface of the microporous material, of from 0.04 to 0.6 mg/(hour*cm.sup.2). In addition, when volatile material is transferred from the volatile material contact surface to the vapor release surface, the vapor release surface is substantially free of volatile material in liquid form.

A BAK removal device is constructed as a plug of microparticles of a hydrophilic polymeric gel that displays a hydraulic permeability greater than 0.01 Da. The polymer hydrophilic polymeric gel comprises poly(2-hydroxyethyl methacrylate) (pHEMA). The particles are 2 to 100 m and the plug has a surface area of 30 mm.sup.2 to 2 mm.sup.2 and a length of 2 mm to 25 mm and wherein the microparticles of a hydrophilic polymeric gel has a pore radius of 3 to 60 m.

A polymer matrix composite comprising a porous polymeric network; and a plurality of functional particles distributed within the polymeric network structure, and wherein the polymer matrix composite has an air flow resistance at 25 C., as measured by the Air Flow Resistance Test, of less than 300 seconds/50 cm.sup.3/500 micrometers; and wherein the polymer matrix composite has a density of at least 0.3 g/cm.sup.3; and methods for making the same. The polymer matrix composites are useful, for example, as filters.

A discharge member with a filter enables a filtrate to be dripped into a dripping container while filtering a suspension, and enables an excessive portion to be suctioned when the dripped amount is excessive, thereby to allow a fixed amount of a filtrate to be injected into the dripping container. The discharge member may enable suctioning operation at the time of suctioning an excessive portion to be conducted without deteriorating its dripping performance and filtering performance. The filter provided in the discharge member is a composite filter in which a pre-filter including a continuous porous foam that is softened at least in a wet state is arranged on a filtration surface side of a membrane filter.

A BAK removal device is constructed as a plug of microparticles of a hydrophilic polymeric gel that displays a hydraulic permeability greater than 0.01 Da. The polymer hydrophilic polymeric gel comprises poly(2-hydroxyethyl methacrylate) (pHEMA). The particles are 2 to 100 m and the plug has a surface area of 30 mm.sup.2 to 2 mm.sup.2 and a length of 2 mm to 25 mm and wherein the microparticles of a hydrophilic polymeric gel has a pore radius of 3 to 60 m.